We've been using MS Teams with a fair degree of success. Only one person needs a copy, everyone else can login via the web. If hosting, I normally send out a link that opens in people's browsers. Having a webcam that's not integrated into your computer is also quite useful as it allows better positioning for whatever board you're using.
If you're not 'hosting' you could argue that you don't even need a camera - there have been a couple of times when Sven's dialled in that it was easier for him just to be on voice (bandwidth issues) although that meant we couldn't see Rachel poking him in the head to distract him

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